For eleven studies we counted what sleep-supplement labels say about doses. For the twelfth, we asked a different question of the same shelf: what do labels say about risk — and what do they choose not to say?
We read the recorded warning statements on 4,153 labels across nine ingredient categories from the NIH label database — every category from our dose studies: melatonin, ashwagandha, magnesium, L-theanine, valerian, GABA, 5-HTP, saffron and apigenin. To our knowledge nobody has counted supplement warnings at this scale before.
The league table
| Category | Labels | Pregnancy | Under-18 | Medications | No warnings |
|---|---|---|---|---|---|
| Melatonin | 589 | 91.7% | 59.1% | 92.5% | 1.5% |
| Apigenin | 79 | 88.6% | 30.4% | 89.9% | 6.3% |
| 5-HTP | 581 | 83.5% | 40.4% | 86.6% | 3.4% |
| Ashwagandha | 357 | 81.5% | 30.0% | 83.8% | 5.6% |
| GABA | 524 | 80.2% | 33.4% | 81.3% | 3.6% |
| L-theanine | 675 | 79.3% | 28.9% | 85.8% | 2.7% |
| Saffron | 178 | 66.9% | 28.1% | 73.0% | 15.2% |
| Valerian | 576 | 62.8% | 21.4% | 59.5% | 11.8% |
| Magnesium | 594 | 61.8% | 13.6% | 77.3% | 2.7% |
Two familiar faces at the extremes. Melatonin is the best-warned ingredient on the shelf — the one actual hormone gets hormone-grade caution, including an 81% rate of drowsy-driving warnings. And valerian is last again: lowest medication-warning rate, and one label in eight carries no warnings at all — the same category that topped our least-readable-labels count.
The rule: warnings track fame, not pharmacology
Generic warnings are everywhere — 60 to 93% of labels tell pregnant women to check with a doctor. But watch what happens when the risk is specific to the ingredient:
- Melatonin & driving: 81% warn. Famous risk, universally copied.
- 5-HTP & antidepressants: 51% warn — we counted this one in detail. Famous enough to make half the labels.
- Magnesium & kidney disease: 5.4%. The reason the NIH sets a supplemental ceiling — impaired excretion — appears on one label in nineteen.
- Ashwagandha & thyroid: 5.3%. The most-discussed ashwagandha interaction in the clinical literature — one label in nineteen.
- Ashwagandha & autoimmune conditions: 0 of 357. Not one label.
The pattern is hard to unsee: labels warn about what’s famous, not about what’s specific. A warning that appears on every competitor’s label gets copied; a risk that lives in the interaction literature but not in popular awareness simply doesn’t make it to print. Our reading — flagged as interpretation — is that warning sections are written by precedent, not by pharmacology review.
The warnings census · 4,153 labels · NIH database
Famous risks get warned about. Specific ones don’t.
Share of labels naming the ingredient’s own specific concern.
On those same 357 ashwagandha labels, “immune” appears 25 times — every one a selling point (“immune support”, “immunity booster”), never a caution. The immune system exists on this shelf only as a benefit.
The ashwagandha detail we checked three times
A zero that big deserved a wider net, so we searched every ashwagandha label’s statements for any form of the word “immune.” It appears 25 times — and every single occurrence is a selling point: “immune support,” “immunity booster,” “supports healthy immune system.” The same immune activity that makes the marketing claim possible is the reason people with autoimmune conditions are commonly advised to be cautious with ashwagandha — our own safety page says so. On these 357 labels, the immune system exists only as a benefit, never as a consideration.
Where we stand
Our conflicts, in full: two of our four ingredients are in this census (ashwagandha, L-theanine), and our safety page carries exactly the specific warnings this study finds missing elsewhere — thyroid and autoimmune considerations for ashwagandha included. So this count flatters our approach; weigh it accordingly. We also note the reverse: nothing here shows our ingredients are safer than the rejected ones — a good warning label describes risk, it doesn’t remove it.
Limits, honestly:
- We counted the label statements recorded in the database. A warning printed on an insert or a website doesn’t count — but the label is what the buyer holds.
- Keyword matching. “Keep out of reach of children” (storage boilerplate) was not counted as an under-18 use warning; creative phrasings may be missed both ways. We hand-checked samples, including every “immune” hit above.
- Categories overlap — a sleep formula containing valerian and GABA appears in both counts; the table describes categories, not unique products.
- Presence of a warning ≠ safety of a product, and absence ≠ danger. We counted words. What the words track — fame over specificity — is the finding.
How to read a warning label in ten seconds
- Ignore the boilerplate; look for the specific. “Consult a physician” appears on nearly everything. The question is whether the label names its own ingredient’s known concern.
- Know the specifics to look for: thyroid and autoimmune for ashwagandha, kidney function for high-dose magnesium, antidepressants for anything serotonergic, driving for anything sedating.
- Treat a specific warning as a quality signal. The FDA doesn’t require it. A label that names its real interaction is a label somebody thought about — on this shelf, that’s rarer than it should be.
How we counted, so you can check us
We used the label caches from our eleven prior studies plus fresh pulls for melatonin (600) and ashwagandha (363), all read from the DSLD on 30 August 2026 — 4,153 labels whose panels list the category ingredient. Warnings were read from each label’s recorded statements with the keyword families listed in our dataset; “no warnings” means no precaution-type statement and no pregnancy, under-18 or medication match anywhere in the statements. The full per-category dataset, including the regex families, is archived and available.
The database is free and needs no account. If you repeat this and get different numbers, we’d like to know.
†These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is educational and is not medical advice; if you have a medical condition or take medication, talk to your healthcare provider before using any supplement.